<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>添加商品</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <el-alert title="添加商品信息" type="info" center show-icon :closable='false'>
      </el-alert>
      <!-- 步骤条区域 -->
      <el-steps :space="200" :active="activeIndex-0" finish-status="success"
        align-center>
        <el-step title="基本信息"></el-step>
        <el-step title="商品参数"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="商品图片"></el-step>
        <el-step title="商品属性"></el-step>
        <el-step title="完成"></el-step>
      </el-steps>
      <!-- tab栏区域 -->
      <el-form :model="addForm" :rules='addFormRulse' ref='addFormRef'
        label-width='100px' label-position='top'>
        <el-tabs v-model='activeIndex' tab-position="left"
          :before-leave='beforeTabLeave' @tab-click='tabClicked'>
          <!-- 1 基本信息 -->
          <el-tab-pane label="基本信息" name='0'>
            <el-form-item label="商品名称" prop='goods_name'>
              <el-input v-model="addForm.goods_name"></el-input>
            </el-form-item>
            <el-form-item label="商品价格" prop='goods_price'>
              <el-input v-model="addForm.goods_price" type='number'></el-input>
            </el-form-item>
            <el-form-item label="商品重量" prop='goods_weight'>
              <el-input v-model="addForm.goods_weight" type='number'></el-input>
            </el-form-item>
            <el-form-item label="商品数量" prop='goods_number'>
              <el-input v-model="addForm.goods_number" type='number'></el-input>
            </el-form-item>
            <el-form-item label="商品分类" prop='goods_cat'>
              <!-- 级联选择框 -->
              <el-cascader expand-trigger='hover' v-model="addForm.goods_cat"
                :options="catelist" :props="cateProps" @change="handleChange">
              </el-cascader>
            </el-form-item>

          </el-tab-pane>
          <!-- 商品动态参数 -->
          <el-tab-pane label="商品参数" name='1'>
            <!-- 先渲染表单的item项 -->
            <el-form-item :label='item.attr_name' v-for='item  in manyTableData'
              :key='item.attr_id'>
              <!-- 复选框组 -->
              <el-checkbox-group v-model="item.attr_vals">
                <el-checkbox :label="cb" v-for='(cb,i) in item.attr_vals'
                  :key='i' border>
                </el-checkbox>
              </el-checkbox-group>
            </el-form-item>

          </el-tab-pane>
          <!-- 商品静态属性 -->
          <el-tab-pane label="商品属性" name='2'>
            <el-form-item :label='item.attr_name' v-for='item in onlyTableData'
              :key='item.attr_id'>
              <el-input v-model="item.attr_vals"></el-input>
            </el-form-item>
          </el-tab-pane>
          <!-- 图片 -->
          <el-tab-pane label="商品图片" name='3'>
            <!-- action表示图片要上传到的后台地址 -->
            <el-upload class="upload-demo" :action="uploadURL"
              :on-preview="handlePreview" :on-remove="handleRemove"
              list-type="picture" :headers='headerObj'
              :on-success='handleSuccess'>
              <el-button size="small" type="primary">点击上传</el-button>
            </el-upload>
          </el-tab-pane>
          <el-tab-pane label="商品内容" name='4'>
            <!-- 富文本编辑器 -->
            <quill-editor v-model='addForm.goods_introduce'></quill-editor>
            <el-button type='primary' class="btnAdd" @click="add">添加商品
            </el-button>
          </el-tab-pane>
        </el-tabs>
      </el-form>
    </el-card>
    <!-- 图片预览框 -->
    <el-dialog title="图片预览" :visible.sync='previewVisible' width='50%'>
      <img :src="previewPath" alt="" class="previewImg">
    </el-dialog>
  </div>
</template>
<script>
export default {
  data () {
    return {
      activeIndex: '0',
      // 添加商品的数据对象
      addForm: {
        goods_name: '',
        goods_price: 0,
        goods_weight: 0,
        goods_number: 0,
        // 商品所属的分类数组
        goods_cat: [],
        // 图片的数组
        pics: [],
        // 商品详情描述
        goods_introduce: '',
        attrs: []
      },
      // 动态参数列表数据
      manyTableData: [],
      // 静态参数列表数据
      onlyTableData: [],
      addFormRulse: {
        goods_name: [
          {
            required: true, message: '请输出商品名称', trigger: 'blur'
          }
        ],
        goods_price: [
          {
            required: true, message: '请输出商品价格', trigger: 'blur'
          }
        ],
        goods_weight: [
          {
            required: true, message: '请输出商品重量', trigger: 'blur'
          }
        ],
        goods_number: [
          {
            required: true, message: '请输出商品数量', trigger: 'blur'
          }
        ],
        goods_cat: [
          {
            required: true, message: '请输出商品数量', trigger: 'blur'
          }
        ]
      },
      // 上传图片的地址
      uploadURL: 'http://127.0.0.1:8888/api/private/v1/upload',
      // 图片上传组件的header 请求头对象
      headerObj: {
        Authorization: window.sessionStorage.getItem('token')
      },
      // 存储预览路径
      previewPath: '',
      // 预览对话框显示标记
      previewVisible: false,
      // 商品分类列表
      catelist: [],
      // 级联选择框的数据对象
      cateProps: {
        label: 'cat_name',
        value: 'cat_id',
        children: 'children'
      }
    }
  },
  created () {
    this.getCatelist()
  },
  methods: {
    async getCatelist () {
      const res = await this.$http.get('categories')
      if (res.meta.status !== 200) return this.$message.error('获取分类列表失败')
      this.catelist = res.data
    },
    // 级联选择器触发的函数
    handleChange () {
      if (this.addForm.goods_cat.length !== 3) {
        this.addForm.goods_cat = []
      }
    },
    beforeTabLeave (activeName, oldActiveName) {
      // console.log('即将离开:' + oldActiveName);
      // console.log('即将进去:' + activeName);
      if (oldActiveName === '0' && this.addForm.goods_cat.length !== 3) {
        this.$message.error('请先选择商品分类')
        return false
      }
    },
    // teb栏点击事件
    async tabClicked () {
      // 证明访问的是动态参数列表
      if (this.activeIndex === '1') {
        const res = await this.$http.get(`categories/${this.cateId}/attributes`, { params: { sel: 'many' } })
        if (res.meta.status !== 200) return this.$message.error('获取参数失败')
        res.data.forEach(item => {
          item.attr_vals =
            item.attr_vals.length === 0 ? [] : item.attr_vals.split(',')
        })
        this.manyTableData = res.data
      } else if (this.activeIndex === '2') {
        const res = await this.$http.get(`categories/${this.cateId}/attributes`, {
          params: { sel: 'only' }
        })
        if (res.meta.status !== 200) return this.$message.error('获取参数失败')
        this.onlyTableData = res.data
      }
    },
    // 处理图片预览效果
    handlePreview (file) {
      this.previewPath = file.response.data.url
      this.previewVisible = true
    },
    // 处理移除图片的操作
    handleRemove (file) {
      // 获取将要删除的图片的临时路径
      const filePath = file.response.data.tmp_path
      // 从pics 数组中 找到这个图片对应的索引值
      const i = this.addForm.pics.findIndex(x => x.pic === filePath)
      // 调用数组的splice方法 把图片信息对象删除
      this.addForm.pics.splice(i, 1)
    },
    // 监听图片上传成功的函数
    handleSuccess (response) {
      // 拼接得到一个图片信息对象
      const picInfo = { pic: response.data.tmp_path }
      // 将图片信息对象, push到pics数组中
      this.addForm.pics.push(picInfo)
    },
    // 添加商品
    add () {
      this.$refs.addFormRef.validate(async v => {
        if (!v) return this.$message.error('请填写必要的表单项')
        // //执行添加的逻辑
        this.addForm.goods_cat = this.addForm.goods_cat.join(',')
        // 处理动态参数
        this.manyTableData.forEach(item => {
          const newInfo = {
            attr_id: item.attr_id,
            attr_value: item.attr_vals.join(' ')
          }
          this.addForm.attrs.push(newInfo)
        })
        // 处理静态参数
        this.onlyTableData.forEach(item => {
          const newInfo = { attr_id: item.attr_id, attr_value: item.attr_vals }
          this.addForm.attrs.push(newInfo)
        })
        //  发起请求添加商品
        // 商品的名称  必须是唯一的
        const res = await this.$http.post('goods', this.addForm)
        if (res.meta.status !== 201) return this.$message.error('添加商品失败')
        this.$message.success('添加商品成功')
        this.$router.push('/goods')
      })
    }
  },
  computed: {
    cateId () {
      if (this.addForm.goods_cat.length === 3) {
        return this.addForm.goods_cat[2]
      }
      return null
    }
  }
}
</script>
<style lang='less' scoped>
.el-steps {
  margin: 15px 15px 0 200px;
}
.el-checkbox {
  margin: 0 10px 0 0;
}
.previewImg {
  width: 100% !important;
}
.btnAdd {
  margin-top: 15px;
}
</style>
